A large corporation wants to find out which benefits plan its employees would prefer. Which procedu would be most likely to obtain a statistically unbiased sample?
a, survey a random sample of employees from a list of all employees
b. invite all employees to indicate their choices by e-mail
c. place suggestion boxes at random locations in the company's plant and offices
d. assemble a group with one member from each department and record the preferences of these
employees
A B C D
Ο Ο Ο Ο